The luxury 930-passenger Viking Orion, with staterooms that all have verandas, is named for its unique connection to space and exploration. The Explorers' Dome, located on the upper level of the Explorers' Lounge, is the first planetarium-like theater at sea and screens films such as "Journey to Space" and "Life Under the Arctic Sky." Cruisers can also enjoy lectures and stargazing sessions with the Viking Resident Astronomer. During your sailing, don't miss the one-of-a-kind Explorations in Space Collection, a tribute to the Apollo and Gemini astronauts. Curated by NASA, it highlights images captured by National Geographic photographers.